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[MPI] optimization for homogeneous clusters
by Riccardo Murri 09 Jul '10

09 Jul '10

Hello, The manual for Boost.MPI 1.43.0 states: "More optimizations are possible on homogeneous machines, by avoiding MPI_Pack/MPI_Unpack calls but using direct bitwise copy. This feature can be enabled by defining the macro BOOST_MPI_HOMOGENEOUS when building Boost.MPI and when building the application." What is the correct way of building Boost.MPI for homogeneous systems? Should I just uncomment the relevant line in boost/mpi/config.hpp, or is there another (and recommended) way through Jam files? Thank you very much in advance for any suggestion. Best regards, Riccardo -- Riccardo Murri, Hadlaubstr. 150, 8006 Zürich (CH)

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FW: Linking to static libraries with Bjam
by Pashley, Mark 09 Jul '10

09 Jul '10

Hi, I am trying to build a boost::python library that uses serialization using BJAM. Unfortunately I cannot get the Jamfile to accept any commands to link the static library libboost_serialization.a into my .so file. I can build simple boost::python libraries but now I need to call functions/classes in this library from my python wrapped classes. My basic jamfile looks like this: project-root ; import python ; extension MyLib : MyClass.cpp <template>@boost/libs/python/build/extension : ; I am running CentOs version 5, boost_1_33_1 (unfortunately I cannot upgrade to a later version) bjam, (built from boost-jam-3.1.18) Currently when I run bjam the environment variable $BOOST_BUILD_PATH is not set, because of this I believe that bjam is building as "v1". If I set $ BOOST_BUILD_PATH to ~/boost_1_33_1/tools/build/v2 I can no longer build even simple examples and I am presented with the errors: error: Could not find parent for project at '.' error: Did not find Jamfile or project-root.jam in any parent directory. If I could get bjam to work with "v2" I believe that I could get syntax correct for adding the library to Jamfile. The directory ~/boost_1_33_1/tools/build/v2 contains: site-config.jam which is empty user-config.jam which has the following lines uncommented: import toolset : using ; using gcc ; using python ; Ultimately I would like to be able to build boost python code with make instead of bjam - has anyone managed this, if so is there an example makefile anywhere? Any help would be greatly appreciated. Regards Mark -- Roke Manor Research Ltd, Romsey, Hampshire, SO51 0ZN, United Kingdom A Siemens company Registered in England & Wales at: Siemens plc, Faraday House, Sir William Siemens Square, Frimley, Camberley, GU16 8QD. Registered No: 267550 ------------------------------------------------------------------------ Visit our website at www.roke.co.uk ------------------------------------------------------------------------ The information contained in this e-mail and any attachments is proprietary to Roke Manor Research Ltd and must not be passed to any third party without permission. This communication is for information only and shall not create or change any contractual relationship. ------------------------------------------------------------------------ Please consider the environment before printing this email -- Roke Manor Research Ltd, Romsey, Hampshire, SO51 0ZN, United Kingdom A Siemens company Registered in England & Wales at: Siemens plc, Faraday House, Sir William Siemens Square, Frimley, Camberley, GU16 8QD. Registered No: 267550 ------------------------------------------------------------------------ Visit our website at www.roke.co.uk ------------------------------------------------------------------------ The information contained in this e-mail and any attachments is proprietary to Roke Manor Research Ltd and must not be passed to any third party without permission. This communication is for information only and shall not create or change any contractual relationship. ------------------------------------------------------------------------ Please consider the environment before printing this email

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Testing that a particular operator is not alllowed
by Edward Diener 09 Jul '10

09 Jul '10

Is there any way to test at compile time, using a Boost construct, that a particular operator is not allowable for a given type, other than simply compile the code and have the compiler generate an error message when trying to use an operator on an object of that type ? I am writing some tests for an MPL library on which I am working where I want to make sure that a given operator for my template class instantiation object will fail to compile, but I would like to do this in such a way that I can generate a compile time message for the failure rather than an actual compiler error. I suspect this is not possible but I thought I would ask anyway.

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Please help with metaprogramming question : termination of recursion
by John Dlugosz 09 Jul '10

09 Jul '10

I'm using Fusion to create a list of Range objects. Here is a simple function: using namespace boost::fusion; template <typename STLCollection, typename FusB, typename FusE> void process_append (STLCollection& collection, const FusB& begin, const FusE& end) { std::cout << "Yip! "; typename result_of::deref<FusB>::type r= deref(begin); /*23*/ collection.insert (collection.end(), boost::begin(r), boost::end(r)); typename result_of::next<FusB>::type successor= next(begin); /*25*/ if (successor != end) process_append (collection, successor, end); std::cout << "Yap! "; } I expect it to print Yip! n times and then Yap! n times. What I get is a compiler error concerning the boost::begin(r) or boost::end(r), that I'm calling it on a fusion::void_ rather than a Range. As you see, I have moved the end-of-recusion test from its normal position at the top of the function (test when called, and return immediately rather than doing the normal body) to the point of the recursive call (don't call with the end sentinel). However, this appears to still trigger the function expansion, since the trail of errors seems to go from the point marked 23 as the original (inner-most) error, to several stops at point 25, to the caller, and so on back out. So it expands several times and then errors, so I think it is objecting to the "end" case. Now if simply mentioning the function, not calling it, is enough to make it expand the function, then more levels of indirection isn't going to help. What is the proper way to do this? Is there, somewhere, a proper example of using Fusion to iterate from begin to end of a Fusion collection? Presumably this must be done using recursion because the type of "next(I)" is not necessarily the same as the type of "I". If some other kind of overloading or partial specialization is the trick, I would expect that the "end" type, or the dereference of the "end" type, would be documented as something I could easily use for that. Please help. Thanks in advance, --John 2>D:\boost_1_43_0\boost/range/iterator.hpp(63) : error C2039: 'type' : is not a member of 'boost::mpl::eval_if_c<C,F1,F2>' 2> with 2> [ 2> C=true, 2> F1=boost::range_const_iterator<boost::fusion::void_>, 2> F2=boost::range_mutable_iterator<const boost::fusion::void_> 2> ] 2> blahblahblah.h(23) : see reference to class template instantiation 'boost::range_iterator<C>' being compiled 2> with 2> [ 2> C=const boost::fusion::void_ 2> ] 2> blahblahblah.h(25) : see reference to function template instantiation 'void Aa::catranges_help::process_append<STLCollection,boost::fusion::cons_iterator<const boost::fusion::nil>,FusE>(STLCollection &,const FusB &,const FusE &)' being compiled 2> with 2> [ 2> STLCollection=std::vector<RTPRICEREC>, 2> FusE=boost::fusion::cons_iterator<const boost::fusion::nil>, 2> FusB=boost::fusion::cons_iterator<const boost::fusion::nil> 2> ] 2> blahblahblah.h(25) : see reference to function template instantiation 'void Aa::catranges_help::process_append<STLCollection,boost::fusion::cons_iterator<Cons>,FusE>(STLCollection &,const FusB &,const FusE &)' being compiled 2> with 2> [ 2> STLCollection=std::vector<RTPRICEREC>, 2> Cons=const boost::fusion::cons<std::pair<std::_Vector_const_iterator<RTPRICEREC,std::allocator<RTPRICEREC>>,std::_Vector_const_iterator<RTPRICEREC,std::allocator<RTPRICEREC>>>,boost::fusion::nil>, 2> FusE=boost::fusion::cons_iterator<const boost::fusion::nil>, 2> FusB=boost::fusion::cons_iterator<const boost::fusion::cons<std::pair<std::_Vector_const_iterator<RTPRICEREC,std::allocator<RTPRICEREC>>,std::_Vector_const_iterator<RTPRICEREC,std::allocator<RTPRICEREC>>>,boost::fusion::nil>> 2> ] 2> blahblahblah.h(25) : see reference to function template instantiation 'void Aa::catranges_help::process_append<STLCollection,boost::fusion::cons_iterator<Cons>,FusE>(STLCollection &,const FusB &,const FusE &)' being compiled 2> with 2> [ 2> STLCollection=std::vector<RTPRICEREC>, 2> Cons=const boost::fusion::cons<std::vector<RTPRICEREC>,boost::fusion::cons<std::pair<std::_Vector_const_iterator<RTPRICEREC,std::allocator<RTPRICEREC>>,std::_Vector_const_iterator<RTPRICEREC,std::allocator<RTPRICEREC>>>,boost::fusion::nil>>, 2> FusE=boost::fusion::cons_iterator<const boost::fusion::nil>, 2> FusB=boost::fusion::cons_iterator<const boost::fusion::cons<std::vector<RTPRICEREC>,boost::fusion::cons<std::pair<std::_Vector_const_iterator<RTPRICEREC,std::allocator<RTPRICEREC>>,std::_Vector_const_iterator<RTPRICEREC,std::allocator<RTPRICEREC>>>,boost::fusion::nil>>> 2> ] 2> blahblahblah.h(55) : see reference to function template instantiation 'void Aa::catranges_help::process_append<std::vector<_Ty>,boost::fusion::cons_iterator<Cons>,boost::fusion::cons_iterator<const boost::fusion::nil>>(STLCollection &,const FusB &,const FusE &)' being compiled 2> with 2> [ 2> _Ty=RTPRICEREC, 2> Cons=const boost::fusion::cons<std::pair<std::_Vector_const_iterator<RTPRICEREC,std::allocator<RTPRICEREC>>,std::_Vector_const_iterator<RTPRICEREC,std::allocator<RTPRICEREC>>>,boost::fusion::cons<std::vector<RTPRICEREC>,boost::fusion::cons<std::pair<std::_Vector_const_iterator<RTPRICEREC,std::allocator<RTPRICEREC>>,std::_Vector_const_iterator<RTPRICEREC,std::allocator<RTPRICEREC>>>,boost::fusion::nil>>>, 2> STLCollection=std::vector<RTPRICEREC>, 2> FusB=boost::fusion::cons_iterator<const boost::fusion::cons<std::pair<std::_Vector_const_iterator<RTPRICEREC,std::allocator<RTPRICEREC>>,std::_Vector_const_iterator<RTPRICEREC,std::allocator<RTPRICEREC>>>,boost::fusion::cons<std::vector<RTPRICEREC>,boost::fusion::cons<std::pair<std::_Vector_const_iterator<RTPRICEREC,std::allocator<RTPRICEREC>>,std::_Vector_const_iterator<RTPRICEREC,std::allocator<RTPRICEREC>>>,boost::fusion::nil>>>>, 2> FusE=boost::fusion::cons_iterator<const boost::fusion::nil> 2> ] 2> blahblahblah.h(53) : while compiling class template member function 'Aa::catranges_help::object<R,Tail>::operator std::vector<_Ty>(void) const' 2> with 2> [ 2> R=std::pair<std::_Vector_const_iterator<RTPRICEREC,std::allocator<RTPRICEREC>>,std::_Vector_const_iterator<RTPRICEREC,std::allocator<RTPRICEREC>>>, 2> TradeStation Group, Inc. is a publicly-traded holding company (NASDAQ GS: TRAD) of three operating subsidiaries, TradeStation Securities, Inc. 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boost::format, print hex
by Lloyd 09 Jul '10

09 Jul '10

Hi, With the following program I am trying to print the hex of "a". But it is not printing it correctly. I have gone through the boost format sysntax specification. But I dont have any clue, what am I doing wrong? char a=0x11; stringstream ss; ss<<boost::format("%|02X|")%a; cout<<ss.str()<<endl; Thanks a lot, Lloyd ______________________________________ Scanned and protected by Email scanner

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Re: [Boost-users] asio, check remote socket open
by ecyrbe 09 Jul '10

09 Jul '10

>Hi, >I have a server application. It listens for connection and receives data. when data is received, the receive "handler routine" is called. Inside the handler there is async timer. This timer's handler again initiates a new >timer.This keeps on executing. During this time, the remote client which connects to the server closes the connection "intentionally". Inside the timer handler routine, is there any way to chek the connection is closed or >not? (From the timer handler, I can access the socket and io_service). >I have tried with >socket::is_open(), socket::remote_endpoint(), they are successfull and does not throw any exception. >Thanks a lot, > Lloyd As it was said, even reading is not reliable in case of a cable disconnection or even some strange ISP interruption. The only way is to try writing something to the user (a sort of application defined ping), beacause this should trigger a tcp error at one moment if the connection was closed. Needless to say, that the tcp client should do the same to detect properly closed connections. You can even add a timeout in both sides to monitor user or server activity (incoming and outgoing data), and close the connection if the timeout is reached....

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[bjam] boost compilation with cxxflags -fPIC
by alfC 09 Jul '10

09 Jul '10

Hi, Please, can anybody tell me how to compile Boost (e.g. 1.43) with the -fPIC as cxxflag: typicially I do ./bootstrap --prefix=$HOME/usr ./bjam ./bjam install There are some threads that give answers but in none of them it is clear exactly what is the command we need to write. I tried with CFLAGS=-fPIC ./bjam ./bjam cxxflags=-fPIC and still the result seems not to use -fPIC Thank you, Alfredo

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asio, check remote socket open
by Lloyd 09 Jul '10

09 Jul '10

Hi, I have a server application. It listens for connection and receives data. when data is received, the receive "handler routine" is called. Inside the handler there is async timer. This timer's handler again initiates a new timer.This keeps on executing. During this time, the remote client which connects to the server closes the connection "intentionally". Inside the timer handler routine, is there any way to chek the connection is closed or not? (From the timer handler, I can access the socket and io_service). I have tried with socket::is_open(), socket::remote_endpoint(), they are successfull and does not throw any exception. Thanks a lot, Lloyd ______________________________________ Scanned and protected by Email scanner

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[process] Child process hangs while capturing stdout
by Allen Cronce 08 Jul '10

08 Jul '10

Hi all, I'm not sure where to post this since boost.process is a candidate and not officially accepted to boost proper. If this should go elsewhere, please let me know. We're seeing hangs when running child command line executables under Mac OS X (posix) while capturing stdout. It seems to happen more often when the command line child app is verbose and spitting out a lot of output. To test this, I created a simple test app that outputs some number of random guids to cout. I then launched this child app from another test app using boost process, indicating that we're capturing stdout. If I run the test with just a few guids outputted (like 100), it works fine. But if I tell the test app to output 1000 guids, the child app hangs every time, attempting to flush the output stream: #0 0x96378249 in write$NOCANCEL$UNIX2003 () #1 0x963781ad in _swrite () #2 0x96376fdd in __sflush () #3 0x96376f79 in fflush () #4 0x91b1ecb2 in std::ostream::flush () #5 0x00005ae6 in main (argc=4, argv=0xbffff608) If I launch the child app manually with the same parameters (i.e. 1000 iterations), rather than programmatically via boost process, it works fine. The code I'm using to configure the environment of the test app is the following: --snip-- // context - Inherit our env and file descriptors bp::context ctx; ctx.environment = bp::self::get_environment(); ctx.stderr_behavior = bp::redirect_stream_to_stdout(); ctx.stdout_behavior = bp::capture_stream(); --snip-- But I've seen the same problem with other configurations, including when both stderr and stdout are being captured to their own streams, and when stdout is being inherited from the parent process. Looks like we're using boost.process 0.31, with some mods and fixes we implemented but have not yet given back (no changes to stdout or stderr capturing, though). We're building with Xcode 3.2.2 and gcc 4.0. We're running under Mac OS X 10.6.4. Any ideas as to what's wrong and how to fix or work around it? Best, -- Allen Cronce

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[program options] Is it possible to add new options during parsing?
by Jorge Moraleda 08 Jul '10

08 Jul '10

Hi, I am wondering if it is possible (and if so, what is the best way) to add new options to a parser during parsing, that is, during the call to run(). The use case scenario is that I have an option called 'type' and if the type specified at runtime equals 'string1' I want to allow and parse a set of extra options (which -of course- can only be specified after type), and if it equals 'string2' then I want to allow and parse a different set of extra options. To do this I am thinking of using a command_line_parser and invoking extra_parser() with a function that will invoke method options() on the command_line_parser object as appropriate. I am wondering if adding options during parsing is going to break something or if there is a cleaner way to achieve this. One of the reasons why I don't like this solution so much is the need to pass somehow the parser object to the funcion that does the extra parsing, although I think I can use bind for that. Thank you. Regards, Jorge

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